Zinc oxide is a versatile material with many applications. Doped nanosized zinc oxide is capable of exhibiting fluorescence. The emission colour of such doped nanoparticles is dependent on the selected dopant, ratio of dopant to zinc oxide, and size of the nanocrystal or aggregate. In this work, we present zinc oxide colloids with different emission colours, and a method of evaluation of the obtained colours. The first step is the preparation of the precursor which is done according to Spanhel’s and Anderson’s sol-gel method [L. Spanhel, M.A. Anderson, J Am Chem Soc, 113, 2826, 1991]. The second step is the condensation process of the precursor with various concentrations of lithium hydroxide to form the ZnO colloid. The optical properties were studied using UV-VIS spectrophotometry and fluorescence measurements. The relative spectral intensities of emission were recalculated into CIExyY and CIELAB colorimetric models to determine the colour of fluorescence in a correct way.Keywords: zinc oxide, lithium hydroxide, fluorescence, colorimetry, nanoparticles
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